Question

ap微积分题目请教

as the tides change, the water level in a bay varies sinusoidally. at high tide today, at 8am, the water level was 15feet; at low tide, 6hours later at 2pm, it was 3 feet. how fast, in feet per hour, was the level dropping at noon today
A 3 B pai(3)^(1/2)/2 C 3(3)^(1/2) D pai*(3)^(1/2) E 6(3)^(1/2)

Answer 1

Answer 2

可以把悬赏给我吗

追问

——————如何做————

追答

我不知道呀，哈哈，我是小学生，这些看不懂的